Techniques for invite enforcement and domain capture. In one embodiment, for example, a method performed in an online service computing environment comprises the operations of: storing, in a database, an association between a team of one or more user accounts and a domain name service domain; receiving a request to invite an e-mail address belonging to the domain name service domain to join the team; creating, in a database, a placeholder user account that is a member of the team; associating, in a database, the e-mail address with the placeholder user account; and after an invitation for the e-mail address to join the team is accepted, converting, in a database, the individual user account to a team account that is (a) a member of the team and (b) associated with the e-mail address.